Low Complexity Detection for Generalized Filter Bank Orthogonal Frequency Division Multiplexing

The space-terrestrial integrated network (STIN) is one of the key development directions for future network architectures, offering global seamless connectivity, efficient resource utilization, and enhanced service reliability. Recently, the generalized filter bank orthogonal frequency division multiplexing (GFB-OFDM) has been proposed for the STIN system, which enables a flexible waveform mechanism for both terrestrial and non-terrestrial systems. However, research on GFB-OFDM detector remains scarce. In this paper, we model the symbol detection problem and introduce the linear detector and the non-linear detector into the GFB-OFDM system. Furthermore, based on the traditional expectation propagation (EP) algorithm, we propose a low-complexity eigenvalue approximation-based EP detector for the GFB-OFDM system, which achieves a lower complexity compared with the existing EP-like detector. Finally, the better error performance and the lower computational complexity of the proposed receiver are validated by the numerical results.